X5CrNiMo17133 Austenitic Stainless Steel,for medical instruments

X5CrNiMo17133 Austenitic Stainless Steel for medical instruments Product Information -:- For detailed product information, please contact sales. -: X5CrNiMo17133 Austenitic Stainless Steel for medical instruments Synonyms -:- For detailed product information, please contact sales. -:

X5CrNiMo17133 Austenitic Stainless Steel for medical instruments Product Information -:- For detailed product information, please contact sales. -: # X5CrNiMo17-13-3 (AISI 317L) Austenitic Stainless Steel for Medical Instruments ## Overview X5CrNiMo17-13-3 (commonly designated as AISI 317L or UNS S31703) is a high-performance austenitic stainless steel specifically formulated with elevated molybdenum content to deliver exceptional corrosion resistance in aggressive environments. As an advanced member of the 300-series stainless steels, it bridges the gap between standard 316/L stainless and super-austenitic grades, offering superior pitting and crevice corrosion resistance that makes it particularly valuable for medical applications involving prolonged exposure to challenging chemical and biological environments. ## International Standards - **ISO 7153-1:** Surgical instruments - Materials - Part 1: Metals - **ASTM A240/A240M:** Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications - **EN 10088-3:** Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products - **ASTM A276/A276M:** Standard Specification for Stainless Steel Bars and Shapes - **UNS S31703:** Unified Numbering System designation - **AISI 317L:** American Iron and Steel Institute designation - **EN 1.4439:** European material number (similar grade with variations) - **ASTM F139:** Wrought 18Chromium-14Nickel-2.5Molybdenum Stainless Steel Bar and Wire for Surgical Implants (comparative standard) ## Chemical Composition (Typical, % by weight) | Element | Standard Range (%) | Medical Grade Target (%) | |---------|-------------------|--------------------------| | Carbon (C) | ≤ 0.030 | ≤ 0.025 | | Chromium (Cr) | 18.0–20.0 | 18.5–19.5 | | Nickel (Ni) | 11.0–15.0 | 13.0–14.5 | | Molybdenum (Mo) | 3.0–4.0 | 3.2–3.8 | | Manganese (Mn) | ≤ 2.00 | ≤ 1.50 | | Silicon (Si) | ≤ 1.00 | ≤ 0.50 | | Phosphorus (P) | ≤ 0.045 | ≤ 0.025 | | Sulfur (S) | ≤ 0.030 | ≤ 0.010 | | Nitrogen (N) | ≤ 0.11 | 0.08–0.12 | | Iron (Fe) | Balance | Balance | **Key Alloying Elements Significance:** - **Molybdenum (3.0–4.0%):** The defining element that significantly enhances resistance to pitting and crevice corrosion in chloride-containing environments - **Chromium (18.0–20.0%):** Provides general corrosion resistance through formation of a stable passive oxide layer - **Nickel (11.0–15.0%):** Stabilizes the austenitic microstructure, improves ductility, and enhances resistance to stress corrosion cracking - **Low Carbon (≤0.030%):** Prevents sensitization during welding or thermal processing - **Nitrogen (optional addition):** Can be added to improve strength and localized corrosion resistance ## Physical Properties (Annealed Condition) | Property | Value | |----------|-------| | Density | 8.00 g/cm³ | | Melting Point | 1370–1400 °C | | Thermal Conductivity | 15.0 W/m·K (at 20°C) | | Specific Heat Capacity | 500 J/kg·K (at 20°C) | | Electrical Resistivity | 0.80 μΩ·m | | Modulus of Elasticity | 195 GPa | | Magnetic Properties | Essentially non-magnetic (paramagnetic) in annealed condition | | Coefficient of Thermal Expansion | 15.9 × 10⁻⁶/K (20–100°C) | | Thermal Diffusivity | 3.8 mm²/s | ## Mechanical Properties (Annealed Condition) | Property | Minimum Value | Typical Value | |----------|---------------|---------------| | Tensile Strength (Rm) | ≥ 515 MPa | 550–650 MPa | | Yield Strength (Rp0.2) | ≥ 205 MPa | 240–300 MPa | | Elongation at Break (A) | ≥ 35% | 40–50% | | Reduction of Area (Z) | ≥ 45% | 55–65% | | Hardness (Brinell) | ≤ 217 HBW | 170–200 HBW | | Hardness (Rockwell) | ≤ 95 HRB | 85–92 HRB | | Fatigue Strength (10⁷ cycles) | 250–300 MPa | 280–320 MPa | **Note:** Strength can be increased by approximately 50-100% through cold working processes. ## Heat Treatment and Processing - **Solution Annealing:** 1040–1120°C followed by rapid cooling (water quenching) to dissolve carbides and maintain maximum corrosion resistance - **Stress Relieving:** 450–550°C for 1–2 hours to relieve internal stresses without significant loss of corrosion resistance - **Stabilization Annealing:** 870–900°C to precipitate carbides in a controlled manner (not commonly used for medical grades) - **No Phase Transformation:** Cannot be hardened by heat treatment; strength improvements achieved through cold working only ## Corrosion Resistance Characteristics X5CrNiMo17-13-3 offers significantly enhanced corrosion resistance compared to standard 316/L, particularly in challenging medical environments: ### **Pitting Resistance Equivalent (PRE)** - **Formula:** PRE = %Cr + 3.3 × %Mo + 16 × %N - **Typical PRE:** 28–32 (compared to 24–26 for 316L) - **Critical Pitting Temperature (CPT):** Typically 30–40°C higher than 316L in chloride solutions ### **Resistance to Specific Media:** - **Excellent:** Body fluids, physiological saline, sterilization solutions, chlorinated disinfectants - **Superior:** Organic acids (acetic, formic), phosphoric acid, sulfurous acid - **Good:** Dilute sulfuric acid, alkaline solutions - **Exceptional:** Chloride-induced pitting and crevice corrosion - **Limited:** Hydrochloric acid, hydrofluoric acid, hot concentrated sulfuric acid ### **Medical Environment Performance:** - **Sterilization Resistance:** Excellent resistance to repeated autoclave cycles, chemical sterilization (ETO, glutaraldehyde), and radiation - **Disinfectant Compatibility:** Superior resistance to chlorine-based disinfectants, peroxides, and aldehyde solutions - **Body Fluid Resistance:** Enhanced resistance to localized corrosion in crevice conditions common in instrument joints and hinges ## Product Applications in Medical Field X5CrNiMo17-13-3 is selected for medical applications where standard 316/L may be insufficient for the required corrosion resistance: ### **Primary Medical Applications:** 1. **Specialized Surgical Instruments:** - Instruments for procedures involving extended exposure to aggressive biological fluids - Microsurgical tools requiring maximum corrosion resistance in critical applications - Orthopedic instruments used in corrosive environments or with aggressive cleaning protocols 2. **Reusable Medical Devices:** - Endoscopic components exposed to aggressive cleaning and disinfection cycles - Surgical instrument components with complex geometries prone to crevice corrosion - Dental instruments subjected to frequent sterilization with chlorine-based solutions 3. **Medical Equipment Components:** - Components in sterilization equipment exposed to high chloride concentrations - Parts in dialysis and blood processing equipment - Chemical handling components in laboratory analyzers and diagnostic equipment 4. **Hospital Infrastructure:** - Critical surfaces in environments with high chemical exposure - Components in pharmaceutical processing equipment ### **Advantages for Specific Medical Uses:** - **Extended Instrument Life:** Particularly valuable for reusable instruments subjected to hundreds of sterilization cycles - **Reduced Maintenance:** Lower susceptibility to pitting and crevice corrosion reduces maintenance requirements - **Enhanced Safety:** Minimizes risk of corrosion-related failures in critical applications - **Chemical Compatibility:** Suitable for use with a wider range of cleaning and disinfection chemicals ## Fabrication and Processing Characteristics ### **Machinability:** - Fair to poor machinability (approximately 40% of free-cutting steel) - High work hardening rate requires careful machining practices - Recommended: Carbide tools, positive rake angles, slow speeds, heavy feeds, adequate cooling - Medical-grade variants may include machinability-enhancing elements ### **Forming and Welding:** - **Good Cold Formability:** Can be formed into complex shapes, though higher forces may be required compared to 304/316 - **Excellent Weldability:** Comparable to 316L with all common welding methods - Recommended filler metals: ER317L, ER309LMo for dissimilar joints - Post-weld annealing recommended for critical applications to restore optimum corrosion resistance - Lower heat input welding methods preferred to minimize sensitization risk ### **Surface Finishing:** - Takes excellent polish to medical-grade surface finishes (Ra < 0.2 μm) - Electropolishing particularly effective for enhancing corrosion resistance - Passivation with nitric acid (20–40%) at 20–60°C for 20–60 minutes - Special surface treatments available for specific medical applications ## Biocompatibility and Medical Compliance ### **ISO 10993 Evaluation:** - **Cytotoxicity:** Typically non-cytotoxic (ISO 10993-5) - **Sensitization:** Low sensitization potential (ISO 10993-10) - **Irritation:** Non-irritating (ISO 10993-10) - **Systemic Toxicity:** Non-toxic (ISO 10993-11) - **Material-Mediated Pyrogenicity:** Typically negative ### **Special Considerations:** - **Nickel Content:** Higher nickel content than 316L may require consideration for nickel-sensitive patients - **Surface Characterization:** Critical for medical applications – must meet specific roughness and cleanliness requirements - **Extractables Testing:** Required for devices with fluid contact - **Sterilization Validation:** Must withstand intended sterilization methods without degradation ## Quality Assurance for Medical Applications ### **Material Certification Requirements:** - EN 10204 3.1 Certificate with full traceability - Chemical analysis per heat/lot - Mechanical property certification - Corrosion test results (ASTM G48 Method A for pitting resistance) - Microcleanliness reports (inclusion ratings per ASTM E45) ### **Medical Device Manufacturing Controls:** - Controlled manufacturing environment (clean room where applicable) - Documented process validation - Surface finish verification - Passivation process validation - Final inspection and testing per device specifications ### **Regulatory Compliance:** - FDA 21 CFR Part 820 compliance for medical device manufacturers - ISO 13485 quality management system requirements - EU MDR 2017/745 compliance for European market - Country-specific regulatory requirements ## Comparison with Other Medical Stainless Steels | Property | X5CrNiMo17-13-3 (317L) | X2CrNiMo17-12-2 (316L) | X2CrNiMoN17-13-5 (904L) | |----------|------------------------|------------------------|--------------------------| | **Mo Content** | 3.0–4.0% | 2.0–2.5% | 4.0–5.0% | | **PRE Number** | 28–32 | 24–26 | 34–38 | | **Chloride Resistance** | Excellent | Very Good | Superior | | **Cost Factor** | 1.5–2.0×316L | 1.0 (Baseline) | 3.0–4.0×316L | | **Availability** | Good | Excellent | Limited | | **Primary Medical Use** | Aggressive chemical environments | Standard instruments & implants | Extreme corrosion applications | ## Limitations and Special Considerations 1. **Higher Cost:** Increased molybdenum content significantly increases material cost 2. **Limited Standardization:** Less frequently specified than 316L in medical standards 3. **Fabrication Challenges:** More difficult to machine and form than 304/316 grades 4. **Nickel Sensitivity:** Higher nickel content may be problematic for highly sensitive patients 5. **Availability:** May have longer lead times than standard medical grades ## Future Developments and Alternatives - **High-Nitrogen 317L:** Enhanced strength and corrosion resistance through nitrogen addition - **Lean Duplex Alternatives:** Consideration of 2205 duplex stainless for specific applications - **Surface-Modified Grades:** Advanced surface treatments to further enhance performance - **Additive Manufacturing:** Special powder formulations for medical 3D printing applications ## Conclusion X5CrNiMo17-13-3 (AISI 317L) represents a premium austenitic stainless steel specifically engineered for medical applications requiring corrosion resistance beyond the capabilities of standard 316/L. Its defining characteristic – elevated molybdenum content – provides exceptional resistance to pitting and crevice corrosion in chloride-containing environments, making it particularly valuable for reusable medical instruments and equipment subjected to aggressive sterilization and cleaning protocols. While its higher cost and fabrication challenges limit its use to applications where its enhanced performance is truly necessary, 317L offers a reliable solution for medical devices operating in demanding chemical and biological environments. Proper material selection, processing, and quality control ensure that devices manufactured from X5CrNiMo17-13-3 meet the stringent requirements of modern medical applications while providing extended service life and enhanced safety in challenging operating conditions. -:- For detailed product information, please contact sales. -: X5CrNiMo17133 Austenitic Stainless Steel for medical instruments Specification Dimensions Size： Diameter 20-1000 mm Length <7411 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: X5CrNiMo17133 Austenitic Stainless Steel for medical instruments Properties -:- For detailed product information, please contact sales. -:

Applications of X5CrNiMo17133 Austenitic Stainless Steel for medical instruments -:- For detailed product information, please contact sales. -: Chemical Identifiers X5CrNiMo17133 Austenitic Stainless Steel for medical instruments -:- For detailed product information, please contact sales. -:

Packing of X5CrNiMo17133 Austenitic Stainless Steel for medical instruments -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3882 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition